That tank is the bee's knees. Out here in the Great Plains of Kansas, you occasionally see that style around farms for propane (and crystal meth production). I highly respect the acid treatment you're giving it and wish I had the time to go through all that with my 60 gallon compressor. What's the black sealant you're using on the various coupling threads? Any concerns about the primary compressor's motor's duty cycle? I've considering picking up a spare tank similar purposes.

Hmm, can't help but wonder, why not T directly off the vertical outlet of the tank? Or do you want exactly this setup?Edit: I'm thinking that's a lot of lever to rip it all off in a catastrophic fashion

What appears to be M52x2.0 - could it not be Whitworth G2"? iirc my compressor tank has a similar plug on one end, I'll have to check though.

Jeff, your tank is already the same capacity as my compressor and this tank combined! :-D If I had that big of a tank (eg vertical style compressor) on my compressor, I likely wouldn't have been keen. I just felt like 70l was too small, even though it ran pretty well without the motor powered up for me. This will last 3x longer than before if powered down.

The other advantage is of course the portability, but I can't think of too many applications where a limited supply would be acceptable. Track day tyre pumping, maybe, but a 12v unit would be a lot more space/weight efficient.

As for the treatment, it was pretty grotty inside with fairly substantial flaking rust in the bottom. It's not pitted and it's mostly still there (near original thickness), so I'm not worried about it being weak.

No idea about the black sealant, original owner (before last) was the one that assembled it in this way.

Zero concerns about the 3 cylinder compressor. The same company makes a continuous rated version with the same pump and motor, just a clutch mechanism so the motor runs no-load when not needed, and is engaged when needed. The wear/tear is on start stop, and this will reduce on/off cycles by a factor of 3, again :-)

ehb, I realised that the thread on the elbow is the same, so I might ditch that and have the socket horizontal, and the filler hanging down on one side at an angle instead. I agree that it's quite long leverage wise, however it shouldn't have more on it than the hose pull, really. I'll be careful, I promise.

Re thread, 12.5 to 12.6 TPI, 51.8 OD. Anything like that aside from M52? Not sure. Doesn't matter as I'm going to MIG a bung in there with a bolt and copper washer for venting if desired. I can cut it out with a hole saw and clean up with a die grinder if desired later. Going to rinse, zinc coat, and lightly oil the interior before doing that, though. Speaking of which, today's mediocre efforts:

Also worth noting, the wheels aren't on parallel. One pair is true to the tank, the other is 5 or 10 degrees off. The only saving grace is the wheels are so loose on the shafts that it allows them to do what they need to to move fluidly :-D

Re Jeff's compressor, I originally wanted one like that, however suddenly this feels like a superior option. The horizontal on-wheels compressor is pretty easy to move around (JUST fits in my Stagea) and so is the tank, and combined they do about the same job as a stand up one :-)

Finished up with almost the last of the air from that tank tonight. Looks like it doesn't leak at all, which is good. Just fittings on the end of hoses seem to leak. Will try to integrate it into the garage and other compressor at some point this year. Until then, or a few minor tweaks, project done. Working 160 litre tank available as required.

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